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Graph 6 - Concentrations of Hydrocarbons inWell NP-2-22 during C-S ar a System Operation <br /> Former Unocal Service Station No. 0187 437 East Miner Ave. <br /> I Stockton, CA <br /> l <br /> 1,800 70 <br /> I <br /> 1,600 <br /> 60 <br /> 1,400 - <br /> 50 <br /> 1,200 <br /> 40 a <br /> 1,000 CL <br /> CL <br /> � N <br /> a 800 30 m <br /> H Began m <br /> Microsparge <br /> 600 <br />' Za <br /> Additional Sparge Points Installed <br /> 400 <br /> Bases e <br /> 10 <br /> ' 200 <br /> 0 0 <br /> D°� os°� OOOOOOOOO� O� O� O� O� D� O� O^ O� O� O� O� O� O`1' O`i' O�' O�' O�' 00000000000� 000�` O�` ' <br /> Sampling date <br /> --45-7PH9 (in ppb) -4--benzene (in ppb) <br />